A. Technical appendix
Festo GDCP-CMXR-C2-HW-EN 1002NH
59
From the very outset, please make sure the wiring and screening is
carried out with care, and in accordance with the guidelines
described.
Basic structure of EMC measures
The EMC concept for the device is aimed at making sure that every module can
individually resist the effects prevalent in an industrial environment where
electromagnetic interference is present. This is based on the screen housing being closed.
This screen housing is suitably expanded by means of screened interfaces or, with
unscreened interfaces, the opened up screen housing is “closed” again by means of
filters.
The relevant connections for screened interfaces are provided on the modules. It is,
therefore, not necessary to connect these cable screenings to the system via additional
screening clamps.
Unscreened interfaces are filtered at their connecting points in accordance with their
required signal. It is, therefore, not necessary to additionally filter these wires.
Which EMC measures must be met?
EMC measures concentrate on the areas:
-
Screening
-
Potential equalisation between system components
It is important that the measures described in the following sections are executed
faultlessly in practice. The most frequent causes of failure are poor contacts in earthing
and screening connections. For this reason, the following general points require particular
mention.
Contacting of earthing and screening connections
-
Low-impedance connection of the parts. This means highly conductive (for high
frequencies also) and is achieved by:
-
extensive connections,
-
earth cables of shortest possible length,
-
use of wide earthing straps instead of wires, if possible.
-
Planiform contact of bare metal is required.
-
Contact surfaces must be protected against corrosion.
-
Use toothed discs when fitting painted parts or parts with an unclean surface; where
possible, on all connecting points.
Just earthing an electrical system is an insufficient EMC measure and is mainly used for
protection against electric shock if conductive parts are touched.
Summary of Contents for CMXR-C2
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